Just a quick question.When a salt chlorinator makes chlorine and then the spent chlorine reverts back to salt, the only chlorine in the pool should be free chlorine?So is the need to test for total & free chlorine is inappropriate?. True or false

The SWG creates free chlorine. The "spent" chlorine would be the combined chlorine AKA chloramines. Add the free chlorine reading to the combined chlorine reading and you get total chlorine.

You DO NOT WANT any combined chlorine in the water. This in itself probably generates the need for more free chlorine than anything else since it the first thing the free chlorine will go after. If it can't get rid of the combined chlorine it just keeps trying.

If you use chlorine, any form, you need to test for both forms and superchlorinate it out, shock it out or oxidize it out, whatever you want to call it (although they are in reality all a bit different).